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Effect of H2O and Y(O) on Oxidation Behavior of NiCoCrAl Coating Within Thermal Barrier Coating
- Source :
- Cailiao gongcheng, Vol 45, Iss 4, Pp 65-69 (2017)
- Publication Year :
- 2017
- Publisher :
- Journal of Materials Engineering, 2017.
-
Abstract
- NiCoCrAl coatings containing Y and Y oxide were made using vacuum plasma deposition and high-velocity oxygen fuel respectively, high temperature oxidation dynamics and cross-section microstructures of NiCoCrAl+Y and NiCoCrAl+Y(O) coatings in Ar-16.7%O2, Ar-3.3%H2O and Ar-0.2%H2-0.9%H2O at 1100℃ were investigated by differential thermal analysis (DTA) and optical and electron microscope. The influencing mechanism of Y oxide on the oxidation of coatings at different atmosphere was compared by computation using First-Principles. The results show that Al2O3 layer on NiCoCrAl+Y coatings has more holes for internal oxidation on account of the element Y diffusion and enrichment on the interface. In addition, steam can promote the internal oxidation. While a thinner and uniform alumina form on NiCoCrAl+Y(O) coatings because element Y is pinned by oxygen atoms during the preparation of coatings. Water vapor has less influence on protective alumina formation on the NiCoCrAl+Y(O) coating. Therefore, oxidation behavior of NiCoCrAl coatings vary in composition and structure in different oxidizing atmosphere. Besides, Y and Y-enrichment oxides have key influences on the microstructure and the growth rate.
Details
- Language :
- Chinese
- ISSN :
- 10014381 and 19664923
- Volume :
- 45
- Issue :
- 4
- Database :
- Directory of Open Access Journals
- Journal :
- Cailiao gongcheng
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.6ccee2ad19664923abb29779eb1a2d77
- Document Type :
- article
- Full Text :
- https://doi.org/10.11868/j.issn.1001-4381.2015.000379